How to create a file on Android Internal Storage

Question

I want to save a file on internal storage into a specific folder  My code is   File mediaDir   new File  media    if   mediaDir exists        mediaDir createNewFile       mediaDir mkdir       File f   new File getLocalPath     f createNewFile    FileOutputStream fos   new FileOutputStream f   fos write data   fos close      getLocalPath returns  data data myPackage files media qmhUZU jpg but when I want to create the media folder I m getting the exception  java io IOException  Read-only file system   Any ideas how to write my files on internal phone storage in in folder media  Thanks

User · Answer

Write a file  When saving a file to internal storage  you can acquire the appropriate directory as a File by calling one of two methods   getFilesDir          Returns a File representing an internal directory for your app    getCacheDir         Returns a File representing an internal directory for your       app s temporary cache files       Be sure to delete each file once it is no longer needed and implement a reasonable       size limit for the amount of memory you use at any given time  such as 1MB    Caution  If the system runs low on storage  it may delete your cache files without warning

User · Answer

I was getting the same exact error as well   Here is the fix   When you are specifying where to write to  Android will automatically resolve your path into either  data  or  mnt sdcard    Let me explain   If you execute the following statement   File resolveMe   new File   data myPackage files media qmhUZU jpg    resolveMe createNewFile      It will resolve the path to the root  data  somewhere higher up in Android   I figured this out  because after I executed the following code  it was placed automatically in the root  mnt  without me translating anything on my own     File resolveMeSDCard   new File   sdcard myPackage files media qmhUZU jpg    resolveMeSDCard createNewFile      A quick fix would be to change your following code   File f   new File getLocalPath   replace   data data             Hope this helps

User · Answer

Hi try this it will create directory   file inside it  File mediaDir   new File   sdcard download media    if   mediaDir exists         mediaDir mkdir       File resolveMeSDCard   new File   sdcard download media hello file txt    resolveMeSDCard createNewFile    FileOutputStream fos   new FileOutputStream resolveMeSDCard   fos write string getBytes     fos close     System out println  Your file has been written

User · Answer

You should create the media dir appended to what getLocalPath   returns

User · Answer

You should use ContextWrapper like this   ContextWrapper cw   new ContextWrapper context   File directory   cw getDir  media   Context MODE PRIVATE     As always  refer to documentation  ContextWrapper has a lot to offer

[android] How to create a file on Android Internal Storage?

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